I tested out my new glock 42 today. I found that it did not like steel ammo at all. The steel being tulamo and monarch steel. Every single shot resulted in a failed shell extraction or a double feed. But once I switched to brass ( monarch brass, federal, and winchester ) she cycled just fine. I kept hitting bullseye's so I pushed my distance as far as the indoor range was capable of. The picture below is of my flock 42 (380acp) at 25 yards. This is for all of y'all who keep saying I should carry a 9. When you can shoot even your full size 9 as accurate as I shoot my CC 380 I'll start listening lol.